4 papers · 1 filter
FLIERs as stagnation knots from partially collimated outflows
Wolfgang Steffen, Jose Alberto Lopez
We propose a new model for the formation of fast, low-ionization emission regions (FLIERs) in planetary nebulae that is able to account for many of their attendant characteristics…
Photo-evaporation of clumps in Planetary Nebulae
Garrelt Mellema, Alejandro C. Raga, Jorge Canto +4
We study the evolution of dense neutral clumps located in the outer parts of planetary nebulae. These clumps will be photo-ionized by the ionizing radiation from the central star a…
IRAS 0421+0400: jets crossing an ISM/IGM interface?
W. Steffen, A. J. Holloway, A. Pedlar +1
The emission lines in the active galaxy IRAS 0421+0400 show a dramatic (~ 900 km/s) increase in the velocity spread at the position of radio hotspots which are located at the begin…
A Helical Model for the Compact Jet in 3C345
W. Steffen, J. A. Zensus, T. P. Krichbaum +2
We present a simple model for the apparent superluminal motion along curved trajectories of features observed in the compact radio jet of the quasar 3C345. The model is inspired by…